低温弱光对西葫芦幼苗抗氧化酶活性和质膜透性的影响

Effects of Low Temperature and Weak Light on Antioxidant Enzymes Activities and Membrane Permeability of Zucchini Seedlings

在不同温度和光照条件下研究了低温弱光组合及持续时间对西葫芦幼苗叶片抗氧化酶活性及细胞膜完整性的影响。结果表明:随着低温弱光胁迫程度增加和时间延长,西葫芦幼苗叶片POD活性提高,SOD和CAT活性下降,MDA含量增加,细胞膜透性增大。在低温和弱光两个胁迫因子中,温度对3种抗氧化酶活性、MDA积累和细胞膜完整性的影响更大。

Under controlled conditions, the responses of cell membrane lipid and antioxidant system of zucchini （ Cucubita pepo L. ）seedlings to low temperature and weak light stress were investigated. The results indicated that membrane permeability, POD activity and the content of MDA increased,while SOD and CAT activities decreased in leaves of zucchini seedlings as the stress degree increased or the time prolonged. Low temperature stress showed greater influence than weak light on the determined indicators.